X的2次方减3的因式分解？ 2x的2次方减x大于3，x等于多少，用因式分解吗？不会算唉
X\u7684\u4e09\u6b21\u65b9\u51cf\u53bb2\u600e\u4e48\u56e0\u5f0f\u5206\u89e3\uff1fx³-2\u5728\u6574\u6570\u548c\u6709\u7406\u6570\u8303\u56f4\u5185\uff0c\u4e0d\u80fd\u56e0\u5f0f\u5206\u89e3\u3002
\u53ea\u5728\u65e0\u7406\u6570\u8303\u56f4\u5185\uff0c\u624d\u53ef\u4ee5\u3002
\u6709\u4ec0\u4e48\u95ee\u9898\u8bf7\u7559\u8a00\u3002
2x²\uff0dx\uff1e3
2x²\uff0dx\u4e003\uff1e0
\u7528\u5341\u5b57\u76f8\u4e58\u6cd5\u56e0\u5f0f\u5206\u89e3
2 \uff0d3
1 1
\uff0d\uff0d\uff0d
2\uff0d3\uff1d\uff0d1
\uff082x\uff0d3\uff09\uff08x\uff0b1\uff09\uff1e0
2x\uff0d3\uff1e0\uff0cx\uff1e3\uff0f2
X\uff0b1\uff1c0\uff0cx\uff1c\uff0d1
\u2234x\uff1c\uff0d1\u6216x\uff1e3\uff0f2
X的2次方-3 =（x+√3）（x-√3 ）
绛旓細1銆佸鏋滄病鏈夊父鏁伴」锛屾妸x鎻愬嚭鏉ワ紝灏辨垚2娆″椤瑰紡浜 2銆佺湅鑳藉惁鐢ㄥ叕寮忥細X1路X2路X3锛濓紞d锛廰锛沊1路X2锛媂1路X3锛媂2路X3锛漜锛廰锛沊1锛媂2锛媂3锛濓紞b锛廰銆3銆佸浜巃x锛3锛媌x锛2锛媍x锛媎锛堝浜x鍥犲紡鍒嗚В锛夛紝鍏堟眰a锛宒鐨勫洜鏁帮紝姣斿p鏄痑鐨勫洜鏁帮紝姣斿q鏄痙鐨勫洜鏁帮紝鎶妜锛漲锛弍甯﹀叆鍘熷紡锛屽鏋滅瓑浜0...
绛旓細鏂规硶濡備笅锛岃浣滃弬鑰冿細
绛旓細鍗佸瓧鍒嗚В娉曠殑鏂规硶绠鍗曟潵璁插氨鏄細鍗佸瓧宸﹁竟鐩镐箻绛変簬浜娆￠」绯绘暟锛屽彸杈圭浉涔樼瓑浜庡父鏁伴」锛屼氦鍙夌浉涔樺啀鐩稿姞绛変簬涓娆￠」绯绘暟銆傚叾瀹炲氨鏄繍鐢ㄤ箻娉曞叕寮(x+a)(x+b)=x²+(a+b)x+ab鐨勯嗚繍绠楁潵杩涜鍥犲紡鍒嗚В銆傛ц川1 绛夊紡涓よ竟鍚屾椂鍔犱笂(鎴鍑忓幓)鍚屼竴涓暣寮忥紝绛夊紡浠嶇劧鎴愮珛銆傝嫢a=b 閭ｄ箞a+c=b+c 鎬ц川2 绛夊紡...
绛旓細x^3-x^2-x-2 ==X^3-2X^2+X^2-X-2 =X^2(X-2)+(X^2-X-2)=X^2(X-2)+(X-2)(X+1)=(X^2+X+1)(X-2)
绛旓細=x³-1-2x²+2x =(x-1)(x²+x+1)-2x(x-1)=(x-1)(x²+x+1-2x)=(x-1)(x²-x+1)
绛旓細2x鍑弜鐨勪笁娆℃柟 =2x-x³=x(2-x²)=x(鈭2+x)(鈭2-x)
绛旓細3娆℃柟鐨勫洜寮忓垎瑙鐨勬柟娉 渚嬪X^3 + 2x -3 鏋侀檺鐨勮繍鐢ㄨ寖鍥..杩樻湁缁欐垜璁茶娉板嫆鍏紡 x³ + 2x -3 瑙傚療鍙戠幇褰 x = 1 鏃讹紝浠ｆ暟寮忎负 0 锛屾墍浠鍒嗚В鍥犲紡 搴旇鍖呭惈 (x - 1)= x³ - x² + x² - x + 3x - 3 = x²(x - 1) + x(x - 1) + 3...
绛旓細4銆丄³-B³=(A-B)(A²+AB+B²)5銆丄³+B³+C³-3ABC=(A+B+C)(A²+B²+C²-AB-BC-AC)涓夋鏂鎬庝箞鍥犲紡鍒嗚В锛氳鏂圭▼涓猴紙x+a锛*锛坸+b锛*锛坸+c锛=0灞曞紑涓篨3+锛坅+b+c锛X2+锛坅b+ac+bc锛塜+abc=0鍜屽師鏂圭▼绯绘暟姣旇緝X3锛孹...
绛旓細1銆佸鏋滄病鏈夊父鏁伴」锛屾妸x鎻愬嚭鏉ワ紝灏辨垚2娆″椤瑰紡浜 2銆佺湅鑳藉惁鐢ㄥ叕寮忥細X1路X2路X3=-d/a锛沊1路X2+X1路X3+X2路X3=c/a锛沊1+X2+X3=-b/a銆3銆佸浜巃x^3+bx^2+cx+d(瀵逛簬x鍥犲紡鍒嗚В)锛屽厛姹俛,d鐨勫洜鏁帮紝姣斿p鏄痑鐨勫洜鏁帮紝姣斿q鏄痙鐨勫洜鏁帮紝鎶妜=q/p甯﹀叆鍘熷紡锛屽鏋滅瓑浜0鐨勮瘽锛(x-q/p)...
绛旓細(x鐨绔嬫柟-1)-(5x鐨勫钩鏂-6x+1)=(x-1)(x鐨勫钩鏂+1+x)-(x-1)(5x-1)=(x-1)(x鐨勫钩鏂+2-4x)
